Honeywell International Inc.

Jean Luc Perrin

Alain Rene Lombard

Patrick Masson

Sebastien Ferrari

A piston () to be mounted inside a cylindrical bore () has a cylindrical surface () provided with at least one axially extending deepening () for accommodating a thermal distortion of the cylindrical bore (). Preferably, the piston is used in a piston valve as a valve control member or turbine as a variable nozzle control member.

Shape detail of a piston to avoid jamming within a distorted bore

A turbine housing assembly includes a tubular piston disposed in a bore of a turbine housing and axially slidable between a closed position and an open position for blocking a nozzle by an amount dependent on axial positioning of the piston. A bypass control member is disposed in the turbine housing and is slidable between a no-bypass position closing a bypass passage and a open bypass opening the bypass passage. The piston is structured and arranged to slide relative to the bypass control member for a part of a full stroke of the piston from the closed position toward the open position thereof, and then to engage the bypass control member and cause the bypass control member to slide together with the piston as the piston further slides toward the open position thereof such that the bypass control member is moved toward the bypass position.

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Grimont, France

Jean Luc Perrin